Samiran Panda1, Harkiran Kaur2, Lalit Dandona3, Balram Bhargava4. 1. ICMR-National AIDS Research Institute, Pune 411 026, Maharashtra; Division of Epidemiology and Communicable Diseases, New Delhi 110 029, India. 2. Public Health Foundation of India, New Delhi 110 017, India. 3. Public Health Foundation of India, New Delhi 110 017; Indian Council of Medical Research (ICMR), New Delhi 110 029, India. 4. Department of Health Research (ICMR), Ministry of Health & Family Welfare, New Delhi 110 001, India.